WASHINGTON — President Donald Trump doesn’t know who to believe about sexual misconduct allegations involving Roy Moore, but isn’t campaigning for his party’s Senate candidate in Alabama because of “discomfort” with the claims made by a number of women, aides said Sunday.

One Republican senator urged Alabama voters to reject Moore in the Dec. 12 election even if that could mean ceding the seat to a Democrat and narrowing the GOP’s 52-48 Senate edge. A second GOP lawmaker...